Energy

Question 1

What is energy?

Answer 1

Energy is the ability to do work or move something

Question 2

What is the principle of conservation of energy?

Answer 2

Energy cannot be created or destroyed, but it can change from one form to another

Question 3

What is a renewable source of energy and give 3 examples

Answer 3

Renewable sources of energy are those that will never be used up

Water
Wind
Sun

Question 4

How do you show chemical energy changing to electrical energy to heat energy?

Answer 4

1. Place a resistance coil under cold water in a beaker with a thermometer in it
2. Connect the cool through a switch to a battery
3. Record the water temperature
4. Close the switch and record the water temperature at two minute intervals

Question 5

How do you show electrical energy changing to magnetic energy to kinetic energy?

Answer 5

1. Wind an insulated wire around a nail
2. Connect the two ends of the wire to a power supply
3. Place loose paper clips under the nail
4. Turn on the current
5. Turn off the current

Question 6

How do you show light energy changing to electric energy to kinetic energy?

Answer 6

1. Connect a solar cell to a miniature motor fan
2. Place the solar cell in the path of strong sunlight or in the beam of a projector. Note what happens
3. Block the light arriving to the solar cell. Again note what happens